In this task, you are given an article. Your task is to summarize the article in a sentence.

Customers of RBS and its subsidiaries, NatWest and Ulster Bank, were unable to use Visa debit and credit cards.
An RBS spokesperson said the breakdown had "minimal customer impact".
It said the problems affected "a small number of people" conducting higher value and international transactions.
The problems started at 7.45am and were resolved by 9.15am, the bank said.
On Thursday, the bank was fined £56m by UK regulators over its huge systems crash in 2012, when 6.5 million customers - equivalent to 10% of the UK population - faced problems that lasted in some cases several weeks.
Also on Friday Barclays online customers experienced some difficulties with their service for a short time.  A Barclays spokesperson told the BBC: "Barclays online banking service was unavailable for around an hour earlier today.
"All other services were up and running as usual during this time however we apologise to those customers that were impacted.  We are currently investigating what caused this to prevent it happening again."
Some Royal Bank of Scotland customers have had problems using credit and debit cards in stores and at cash machines, the day after RBS was fined £56m for its 2012 computer meltdown.

A motion was put forward at the bank's annual meeting and needed 75% of shareholders to vote in favour.
However only 64.7% of those present backed the plan, with the German government using its 17% voting stake to vote against it.
Commerzbank was rescued by the government in 2008.
Under new rules introduced by the European Union in the wake of the financial crisis, shareholder approval is needed for any bonus plan that exceeds an employee's base salary.
The finance ministry said the bank had failed to provide a convincing explanation for why such a bonus was needed.
However it did approve a separate proposal to allow certain executives to receive compensation worth 140% of their pay.
This "sets sensible incentives to reach targets and successfully implement strategic goals that the federal government will ultimately benefit from", it said in a statement.
Separately, Commerzbank said it would launch an internal investigation into the actions that led to it paying a $1.45bn settlement in the US for violating economic sanctions against businesses in Iran and Sudan.
The German government has blocked a plan by Commerzbank to pay bonuses to its top staff worth double their basic salary.

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